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Finding the Fourth Proportional to 490,123,252.40, 687,894,422.20 and 490,123,252.40

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Solution

The fourth proportional to 490,123,252.40, 687,894,422.20 and 490,123,252.40 is: 687,894,422.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,123,252.40 : 687,894,422.20 = 490,123,252.40 : x
  2. Step 2: Convert to fraction form
    490,123,252.40/687,894,422.20 = 490,123,252.40/x
  3. Step 3: Cross multiply
    490,123,252.40x = 687,894,422.20 × 490,123,252.40
  4. Step 4: Simplify right side
    490,123,252.40x = 337,153,051,516,482,752
  5. Step 5: Solve for x
    x = 337,153,051,516,482,752/490,123,252.40
  6. Step 6: Final answer
    x = 687,894,422.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.